[BUG FIX] [MER-4033] fix evaluation of signed floats without leading zero #5262
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Torus accepts floating point input without leading zero, e.g.
.333. However, evaluation code was not properly handling this form when a sign was prefixed, e.g.-.333, causing answers of this form to be marked incorrect. Error was caused by a step where code converts the zero-less form to a zero-prefixed form; regexp used there was not allowing for possible sign.This also adds a few unit tests for this case.